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Sensor warming – Vaisala DMT346 User Manual

Page 135

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Chapter 4 _________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 135

Example (no data logger module installed):

>pur
Interval Purge : ON ?
Interval : 1440 min ?
Power-up Purge : ON ?
Duration : 60 s ?
Settling : 240 s ?
Temperature : 180 'C ?
Temp. diff. : 0.5 'C ?
Trigger Purge : OFF ?
RH trigger : 20 %RH ?
>

Example (with data logger module installed):

>pur
Interval Purge : ON ?
Interval : 1440 min ?
Next Purge date: 2011-03-31 ?
Next Purge time: 12:00:00 ?
Power-up Purge : ON ?
Duration : 60 s ?
Settling : 240 s ?
Temperature : 180 'C ?
Temp. diff. : 0.5 'C ?
Trigger Purge : OFF ?
RH trigger : 20 %RH ?
>

NOTE

To activate the new interval settings immediately, reset the transmitter.

NOTE

When sensor purge in power-up is enabled, wait about 6 min after power
up before taking measurements. The output channels are locked for the
first operation minutes to the initial measured values

Sensor Warming

DMT345 and DMT346 contain a sensor warming function, that is, when
humidity reaches a set limit (default: 80%RH), sensor warming operation
is activated automatically. Sensor warming continues as long as the
humidity is above that limit.

When the warming starts, the sensor operation indicator is displayed on
the optional display and relays configured as "online status" (if any) will
be released. Warming does not affect T

d/f

,T

d/f atm,

T

d

,T

d atm,

x, H

2

O and P

w

quantities, all others will be frozen.

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